it tells me there are no ebuilds to satisfy that. If I try to emerge boost, I only see the one from main portage listed. What have I done wrong?

EDIT:
This would be because of my lack of understanding. I have to add the overlay using the name openoffice-geki, but portage thinks it's ::geki-overlay

Now that I got that worked out, boost-log is complaining because no ebuilds satisfy it's requirement of dev-libs/boost[datetime,filesystem,regex], the boost package in this overlay uses date_time though. So that's never going to merge?